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Preparation of π-vi Semiconductor Nanocrystallites in a GlassMatrix Using Chalcogenizing Agent: Application to cdse

Published online by Cambridge University Press:  21 February 2011

J.L. Marc ,
W. Gramer ,
A. Pradel ,
M. Ribes ,
T. Richard ,
J. Allegre  and
P. Lefebvre
J.L. Marc
Affiliation:
Laboratoire de Physicochimie des Matériaux Solides, URA 407 du CNRS, Université Montpellier II, 34095 Montpellier Cedex 5, France.
W. Gramer
Affiliation:
Laboratoire de Physicochimie des Matériaux Solides, URA 407 du CNRS, Université Montpellier II, 34095 Montpellier Cedex 5, France.
A. Pradel
Affiliation:
Laboratoire de Physicochimie des Matériaux Solides, URA 407 du CNRS, Université Montpellier II, 34095 Montpellier Cedex 5, France.
M. Ribes
Affiliation:
Laboratoire de Physicochimie des Matériaux Solides, URA 407 du CNRS, Université Montpellier II, 34095 Montpellier Cedex 5, France.
T. Richard
Affiliation:
Laboratoire de Physicochimie des Matériaux Solides, URA 407 du CNRS, Université Montpellier II, 34095 Montpellier Cedex 5, France.
J. Allegre
Affiliation:
Groupe d'Etude des Semiconducteurs, URA 357 du CNRS, Université Montpellier II, 34095 Montpellier Cedex 5, France.
P. Lefebvre
Affiliation:
Groupe d'Etude des Semiconducteurs, URA 357 du CNRS, Université Montpellier II, 34095 Montpellier Cedex 5, France.
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Abstract

A new route for preparing CdX (X = S, Se, Te, S+Se) nanocrystallitesdispersed in a sodium borosilicate glass matrix from a hydrogel is proposed.Chalcogenizing complexing molecules - for instance a mixture of NH4SCN + H2SeO3 - introduced in thestarting solution allowed an in situ crystallitepreparation concomitant to gel densification. Prevention of crystalliteoxidation is thus obtained. Moreover, coalescence is minimized because ofthe low gel-glass transition temperature. Low temperature absorption spectrahave been interpreted in terms of exciton and electron-hole confinements,accounting for both an intrinsic broadening of energy states inside eachnanocrystal and a Gaussian size distribution. Crystallite sizes and sizedispersion can be adjusted by changing the initial Cd concentration. Thecrystallinity of the nanoparticles without change in dispersion is stronglyimproved by thermal treatment above the Tg of the glassmatrix.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 901
Copyright
Copyright © Materials Research Society 1998

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References

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